I know some one who bought one of these, most of the mechanical parts look pretty decent, many machined, etc. The vest itself could use some work, he is replacing the plastic clasps with metal aircraft seatbelts as he doesn't want to watch a 20K camera go crashing to the floor. The things pop open under load, but if you're up for a little bit of hackary, it looks promising.
Please contact me when you get it and tell me what you think, I'll give you some more direct feedback from another owner.

What I got so far required mods and feedback
(1) replace plastic clasps with aircraft seatbelts ($20 each on ebay x 5), and your local tailor
(2) Locktite all the bolts on the arm
(3) The paint on the sled lasts about 30 seconds and there is a plastic bolt that was cross threaded on delivery
(4) As soon as he gets the replacement sled from the manufacture and replaces the clasps with seatbelts, he is going to attempt to calibrate it.. thats when I will give you some real feedback. Let me know if you got one, what do you think...